Hi I have a scenario with which I wish to understand . I have a ball on a string which is in uniform circular rotation at Tangential velocity v Assume friction is not present I now increase the centripetal force by pulling on the string from the centre, what has happened to the tangential velocity ? I have seen a few posts which says that as the centripetal velocity is perpendicular to the tangential a change in this force will not result in an increase in the tangential velocity. but intuition tells me that as the ball is forced onto a smaller and smaller radius its rotational speed will increase. If I thought of this as the components acting upon it - Tangential inertia and Centripetal force then as I increase the force the angle of the resultant vector will decrease . Doesn't this mean it has a greater rotational velocity ? doesn't that infer greater tangential velocity ?